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  • VI Pro CPU Usage

    pkreter_30363P
    pkreter_30363P

    I've installed build 7043 of VI Pro and VI Ensemble on my Win XP 32 bit PC.  Overall, it's working well but I've still had a few audio pops and crackles.  I've noted two interesting things about VI Pro CPU usage.

    1) Windows Task Manager indicates a much higher CPU utilization for VI Pro than the application lists itself in its status bar.

    2) VI Pro CPU usage is much lower when the program is minimized (User Interface hidden)

    When I run VI Pro standalone and load a single patch, the program indicates a CPU usage of 0.7% to 3.0%.  Windows Task Manager, however, reports VI Pro  CPU usage varying between 3% to 31% as I play single note lines on the keyboard.  If I minimize VI Pro to the Windows Task Bar, hiding the user interface, Task Manager indicates VI Pro CPU usage varying between 2% to 5% as I play.  That's a significant drop in the peak readings from 31% with the User Interface open to 5% when the UI is hidden.

    The behavior in Vienna Ensemble is similar.  After instantiating a VI Pro channel in Vienna Ensemble, the CPU usage indicated by Task Manager is much higher than the CPU meter in Vienna Ensemble.  If I switch to the mixer view so that the VI Pro channel window is hidden, Task Manager reports a much lower CPU usage for Vienna Ensemble.

    Can anyone else confirm this behavior?

    Thanks,

    Paul
  • K
    K

    The readout in the Task Manager is actually not relevant. The VI Pro GUI is running at a lower priority than the audio processing, so it will not cause any snaps, crackles or pops. It will basically run at a lower framerate when overall CPU usage is high.
  • pkreter_30363P
    pkreter_30363P

    Karel,

    Thanks for explaining this.  In order to further try to isolate the pops and ticks I've been hearing, I loaded a single instance of VI Pro in Cubase 5.5 and found that the VST perfomance meter remained very low no matter if I played a lot of notes or if the GUI was open or close.  This seems to confirm the point you made.  I then realized I hadn't had a single pop or tick since using VI Pro inside Cubase!

    I then loaded Vienna Ensemble in Cubase and instantiated 4 channels of VI Pro.  I loaded 4 different matrices and made a quick midi sequence.  I ran this sequence for a 1/2 hour and it played perfectly without ticks and pops!

    I closed Cubase and restarted VI Pro standalone.  Within minutes of playing I heard a few ticks again.

    So within Cubase the new build is working perfectly for me.  This is what is most important for me.  The occasional tick in standalone mode  is aggravating but not a showstopper.

    Thanks again,

    Paul